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From: talcott@nunki.usc.edu (Adam Talcott)
Newsgroups: comp.sys.mac.misc
Subject: Centering Dialog Boxes on the Macintosh
Summary: How can I center a dialog box?
Message-ID: <11818@chaph.usc.edu>
Date: 4 Sep 90 15:24:04 GMT
Sender: news@chaph.usc.edu
Organization: University of Southern California, Los Angeles, CA
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Nntp-Posting-Host: nunki.usc.edu

Over the summer I began to learn to use the Macintosh Toolbox.  I have begun
writing my first piece of Macintosh software and have stumbled into one
problem.  I understand that Apple's Interface Guidelines requires dialog boxes
to be centered horizontally and have one-third of the screen above the dialog
and two thirds of the screen below.  My problem is I can center the border of
the dialog to conform to these standards, but the contents of the dialog box
do not move!!  What do I do to move this?  The following are the lines of code
I use (in THINK C):

CenterDialog( whichDialog )
DialogPtr	whichDialog;
{
   Rect   dialogRect;
   int    dialogWidth, dialogHeight, screenWidth, screenHeight;
	
   if ( whichDialog != NIL_POINTER )
   {
     screenWidth = ( screenBits.bounds ).right - ( screenBits.bounds ).left;
     screenHeight = ( screenBits.bounds ).bottom - ( screenBits.bounds ).top;
     dialogWidth = ( whichDialog->portRect ).right - ( whichDialog->portRect ).left;
     dialogHeight = ( whichDialog->portRect ).bottom - ( whichDialog->portRect ).top;
		
     /* Center horizontally */
     ( whichDialog->portRect ).left = ( screenWidth - dialogWidth ) / 2;
     ( whichDialog->portRect ).right = ( whichDialog->portRect ).left + dialogWidth;
		
     /* Place one-third of screen above, two-thirds of screen below dialog */
     ( whichDialog->portRect ).top = ( screenHeight - dialogHeight ) / 3;
     ( whichDialog->portRect ).bottom = ( whichDialog->portRect ).top + dialogHeight;
   }
}

Any help is greatly appreciated (if you didn't understand, e-mail and I'll
attempt to explain it better).



-- 
| Adam Talcott                               | Not a bad bit of rescuing,    |
| talcott@nunki.usc.edu                      | huh?  You know, sometimes I   |
| Electrical Engineering (Computers) Senior  | even amaze myself.            |
| University of Southern California          |                    --Han Solo |